Occasional Papers of the Museum of Zoology 3 



a. Ground-color : white to buff and old rose. 



b. Inside of aperture : buff' to light chocolate-brown and 

 scarlet, corresponding to the three extremes of ground-color. 



The stripes of the exterior also show through the shell. 



c. Tip of spire (embryonic whorls always absent in 

 adults ) : purplish-black through dark chocolate-brown to the 

 £ame shades as the ground-color. The shells with the pink- 

 ish general coloration often have salmon or scarlet tips. 



d. Spiral bands : 



1. Xumber : the maximum is 5; one near the suture 



(only in one specimen) ; a group of 3 near the 

 greatest ventricosity ; and 2 around the umbilicus 

 in the region of the parietal wall of the aperture. 

 Commonly, only one band is present ; this may be 

 the central one of the peripheral group, or, even 

 more commonly, the upper of the umbilical pair. 



2. Color: any shade of the series given for the tips, 



except the purplish-black. 



3. Continuity : either entire or broken into square dots ; 



narrow and sharply marked, or wide and diffuse. 

 Sometimes the central group of 3 fuse into a sin- 

 gle broad band. 



e. Varices : the commonest form of banding consists sim- 

 ply of dift'use axial varices, which var\- in color as do the 

 stripes. One specimen has yery distinct chocolate-brown vari- 

 ces, with flammulations corresponding to the position of the 

 spiral ridges; near the ai)erture l)and 4 is entire and.verv i)rom- 

 inent. 



Although variable in shajie. all of the specimens are quite 

 typical of T. iiiccjachcilos. Xo specimens approaching T. cos- 



